How can I tell if my septic tank needs cleaning in Langley's climate and soil conditions?

In Langley's climate and soil conditions, signs your tank needs cleaning include slow-draining fixtures, gurgling pipes, sewage odours near the tank or drainfield, unusually green grass over the field, and standing water in the yard. If your tank hasn't been pumped in 3-5 years, schedule a check even if you don't see warning signs.